Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Heat Value

The gross (high) and net (low) heating values

Sponsored Links

The heat value is

  • the amount of heat produced by combustion a unit quantity of a fuel

We differentiate between gross and net heating values:

Gross (or high, upper) Heating Value

The gross or high heating value is the amount of heat produced by the complete combustion of a unit quantity of fuel.

The gross heating value is obtained when

  • all products of the combustion are cooled down to the temperature before the combustion
  • the water vapor formed during combustion is condensed

In thermodynamics, the term standard heat of combustion corresponds to Gross heating value. See Heat of combustion for examples of calculation of gross heating values from standard heat of formation of substances.

Net (or lower) Heating Value

The net or lower heating value is obtained by

  • subtracting the latent heat of vaporization of the water vapor formed by the combustion

from the gross or higher heating value.

Common Units

Common units for heating value:

  • 1 Btu/lb = 2326.1 J/kg = 0.55556 kcal/kg
  • 1 J/kg = 0.00043 Btu/lb = 2.39x10-4 kcal/kg
  • 1 kcal/kg = 1.80 Btu/lb = 4187 J/kg
Sponsored Links

Related Topics

Related Documents

Tag Search

  • en: gross net heating value high low
Sponsored Links

Search the Engineering ToolBox

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse!

Translate this page to
About the Engineering ToolBox!

Citation

This page can be cited as

  • Engineering ToolBox, (2005). Heat Value. [online] Available at: https://www.engineeringtoolbox.com/gross-net-heating-value-d_824.html [Accessed Day Mo. Year].

Modify access date.

Customize Ads in the ToolBox

Make ads more useful in Google Ad Settings .

. .

close

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Scientific Online Calculator

Scientific Calculator

11 16

Sponsored Links
.